Michael Tuexen 8ff4fc03e6 traceroute6: fix capabilities for the rcv socket
On the receive socket, recvmsg() and poll()/select() is called.
Therefore, CAP_EVENT is needed in addition to CAP_RECV..

While there, check the socket for readbility before calling recvmsg().

Reviewed by:		markj@
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D36878
2022-10-04 23:40:29 +02:00
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